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Per NCERT §4.2.1, the LATTICE ENTHALPY of an ionic solid is defined as which quantity?
AEnergy required to completely separate one mole of solid ionic compound into gaseous constituent ions
BEnergy of ionisation of solid
CEnergy of melting
DBond energy of one ionic bond
Answer & Solution
Correct answer: A. Energy required to completely separate one mole of solid ionic compound into gaseous constituent ions
Per NCERT §4.2.1, lattice enthalpy = energy to dissociate 1 mol solid → gaseous ions (infinite separation). NaCl: 788 kJ mol⁻¹.
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